Butterfly Valves - Torque, Head Loss, and Cavitation by American Water Works Association

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By American Water Works Association

During this ebook water operators obtain whole information regarding the flexible butterfly valve in ingesting water carrier. Engineers and technicians will achieve a easy figuring out of calculations for working torque, head loss, and cavitation. insurance contains valve layout, torque, head loss, cavitation, trying out, noise, and vibration.

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Additional info for Butterfly Valves - Torque, Head Loss, and Cavitation Analysis - Manual of Water Supply Practices, M49

Sample text

American Water Works Association. 2010. ANSIIAWWA C516-10: Standard for Large Diameter Rubber-Seated Butterfly Valves, 78 in. (2,000 mm) and Larger. : AWWA. Crane. 2009. Flow of Fluids Through Valves, Fittings and Pipe, Technical Paper No. 410. Instrument Society of America (ISA). 2008. 01-2008. Control Valve Capacity Test Procedure. : Instrument Society of America. AWWA MANUAL Chapter 3 Valve Head Loss A butterfly valve, like any restriction in a pipeline, is a source of head loss. As a butterfly valve closes, the head loss increases until the entire system head is established across the valve.

When calculating the torque of a butterfly valve, the system should be evaluated as two components: the valve and the system piping. In a system with a variable head source, AH,,, will change depending on flow conditions at a particular time. This analysis assumes that no other variable loss coefficient components, such as control valves, are changing in the system. Therefore, the velocity head loss coefficient of all components other than the butterfly valve can be considered constant and equal to KEY,.

AWWA. American Water Works Association. 2010. ANSIIAWWA C516-10: Standard for Large Diameter Rubber-Seated Butterfly Valves, 78 in. (2,000 mm) and Larger. : AWWA. Crane. 2009. Flow of Fluids Through Valves, Fittings and Pipe, Technical Paper No. 410. Instrument Society of America (ISA). 2008. 01-2008. Control Valve Capacity Test Procedure. : Instrument Society of America. AWWA MANUAL Chapter 3 Valve Head Loss A butterfly valve, like any restriction in a pipeline, is a source of head loss. As a butterfly valve closes, the head loss increases until the entire system head is established across the valve.

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